Turbo C Graphics - sector function
ellipse function is used to draw a ellipse by accepting 6 parameters the center point (x,y) and the xradius and yradius and start and end angle parameters. It draws just the outline of the ellipse and it does not fill anything.
sector is the function very similar to ellipse but can fill with any color and / or style set by setfillstyle function.
fillellipse takes only 4 parameters center point and xradius and yradius and is capable of filling with any color and / or style set by setfillstyle function.
Here is the sample code with ellipse, fillellipse and sector. In the output screen you can see a fillellipse with BLUE color SOLID_FILL and an inner ellipse and .
setfillstyle(SOLID_FILL, BLUE);
fillellipse(cx, cy, xradius, yradius);
outtextxy(cx - 95, cy - yradius + 20, "fillellipse 0-360 deg");
// fill a sector (pie) with close dot fill
setfillstyle(CLOSE_DOT_FILL, GREEN);
sector(cx, cy, 0, 270, xradius - 30, yradius - 40);
outtextxy(cx - 30, cy - 50, "sector 0-270 deg");
// draw an elipitical arc and have two ends of arc joined with center point by two lines
setcolor(YELLOW);
moveto(cx + 5, cy + 5);
linerel(xradius - 30, 0);
moveto(cx + 5, cy + 5);
linerel(0,yradius - 40);
ellipse(cx + 5, cy + 5, 270, 0, xradius - 30, yradius - 40);
outtextxy(cx + 20, cy + 30, "Ellipse 270-360 deg");
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Source Code
#include <graphics.h>
#include <stdio.h>
#include <math.h>
#include <conio.h>
#include <dos.h>
#include <stdlib.h>
int InitGraphics()
{
int grd, grm;
int gresult;
// Detect the graphics driver and mode
detectgraph(&grd,&grm);
// initialize the graphics mode with initgraph
initgraph(&grd, &grm, "");
gresult = graphresult();
if(gresult != grOk)
{
printf(grapherrormsg(gresult));
getch();
return -1;
}
// set the background color
setbkcolor(RED);
// set the foreground color
setcolor(WHITE);
// draw a white color border with rectangle
rectangle(0,0,getmaxx(),getmaxy());
return 1;
}
void main()
{
int i, x, y, w;
int left,top,right,bottom;
int margin;
int xradius, yradius;
int cx, cy;
if(InitGraphics() == -1)
return;
margin = 100; // 100 pixel margin
left = margin;
top = margin;
bottom = getmaxy() - margin;
right = getmaxx() - margin;
xradius = (right - left) / 2;
yradius = (bottom - top) / 2;
cx = (left + right) / 2;
cy = (top + bottom) / 2;
// fill an ellipse will BLUE color SOLID
setfillstyle(SOLID_FILL, BLUE);
fillellipse(cx, cy, xradius, yradius);
outtextxy(cx - 95, cy - yradius + 20, "fillellipse 0-360 deg");
// fill a sector (pie) with close dot fill
setfillstyle(CLOSE_DOT_FILL, GREEN);
sector(cx, cy, 0, 270, xradius - 30, yradius - 40);
outtextxy(cx - 30, cy - 50, "sector 0-270 deg");
// draw an elipitical arc and have two ends of arc joined with center point by two lines
setcolor(YELLOW);
moveto(cx + 5, cy + 5);
linerel(xradius - 30, 0);
moveto(cx + 5, cy + 5);
linerel(0,yradius - 40);
ellipse(cx + 5, cy + 5, 270, 0, xradius - 30, yradius - 40);
outtextxy(cx + 20, cy + 30, "Ellipse 270-360 deg");
setcolor(WHITE);
// Draw circles
circle(left, top, 25);
circle(right, top, 25);
circle(left, bottom, 25);
circle(right, bottom, 25);
// Draw pie slice
setfillstyle(SOLID_FILL, GREEN);
pieslice(right, top, 0, 90, 25);
pieslice(left, top, 90, 180, 25);
pieslice(left, bottom, 180, 270, 25);
pieslice(right, bottom, 270, 360, 25);
// Draw arc
arc(right, top, 0, 90, 35);
arc(left, top, 90, 180, 35);
arc(left, bottom, 180, 270, 35);
arc(right, bottom, 270, 360, 35);
getch();
closegraph();
}
Output
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